Results Overall, rapid viral response did not differ between the two groups, whereas the rates of complete early viral response (p=0.03), end-of-treatment viral response (p=0.03) and SVR (p=0.001) were significantly higher in SOC+B12 patients than in SOC patients. In SOC+B12 patients, the SVR rate was also significantly higher in carriers of a difficult-to-treat genotype (p=0.002) and in patients with a high baseline viral load (p=0.002). Distribution of genotype IL-28B did not differ between the two groups. At multivariate analysis, only easy-to-treat HCV genotypes (OR=9.00; 95% CI 2.5 to 37.5; p=0.001) and vitamin B12 supplementation (OR=6.9; 95% CI 2.0 to 23.6; p=0.002) were independently associated with SVR.

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